Q.Electron Microscope was first introduced by ________.

Microscopy is the study of cells using microscopes, instruments that exploit lens properties (reflection, magnification, numerical aperture) to make tiny objects visible. Magnification is the optical increase in apparent image size; resolution (0.61λ/NA) is the more meaningful measure of how finely two close points can be told apart. The bright field microscope is the routine compound microscope, passing light through a condenser, specimen, objective lens (primary, real, inverted image) and eyepiece (secondary, virtual, inverted image), with contrast improved by staining. The dark field microscope (Sigmondy, 1905) uses a patch stop to let only oblique peripheral light strike the specimen, so it glistens against a dark background. The phase contrast microscope (Zernike, 1935) uses a phase plate to convert tiny phase/speed differences in light passing through a transparent living specimen into visible contrast, ideal for observing living, unstained cells. The electron microscope (Ruska, 1931; developed by Binning and Roher, 1981) uses an ac …